``Shares of Uber fell more than 7% on its first day of trading Friday, marking a rocky Wall Street debut for a company that endured plenty of bumps on its long road to going public. Uber opened at $42 a share, below its IPO price of $45, and ended the day even lower at $41.57.

That disappointing first day performance sets Uber apart from the vast majority of its tech peers. In the past five years, only 10% of venture capital-backed US technology IPOs finished the first day in the red, according to data provided to CNN Business from Renaissance Capital, which manages IPO-focused exchange-traded funds.

Uber did succeed in raising $8.1 billion in one of the largest public offerings ever, a substantial war chest that should fund the company's expansion into new cities and service categories. But that amount was still at the low end of what Uber originally set out to raise.

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shares in Lyft fell below their IPO price on their second day of trading and have continued to tumble since. The stock is now down about 25% from the IPO price... tech companies that have come to market in recent years with massive losses -- including Lyft and Snap -- are currently "not trading above their IPO price."